There is sentence in my seminar about electric. I am not sure I understand correct or not. Thank much?

Question

I am not native English. There is sentence in my seminar: “Tips to save energy at you home”. I am not sure I understand correct or not. Please help me to explain. Thank you very much.

Original sentence:
Plug anything that can be powered by a remote control or that has a power cube transformer (little black box) into a power strip, and turn it off, and/or unplug, when not in use. (Power cubes are 60-80 percent inefficient.)
I understand that 
- When we first power off TV by remote control, we should unplug then to save energy. And when we charges battery (laptop, mobile…), when battery is full, we also unplug from power strip, so that we can save energy.
- “Power cubes are 60-80 percent inefficient”: means when battery is full, if we still plug into power strip, there is only 60-80% still in not using… But we waste remain 20-40% energy.
- Power cube transformer and Power cube is same ??? I understand them as battery charger (of mobile, camera and others)

TV guy · Accepted Answer

You are correct, power cubes are indeed chargers or transformers.
60-80% inefficient sounds a bit too much, especially when the devices are off, but if they say so....
My guess is that those power cubes consume less than 1 watt each when in stand-by, but it all adds up.

There is sentence in my seminar about electric. I am not sure I understand correct or not. Thank much?

1 Answer